Abstract: An extended throw deadbolt lock including a housing having a face plate and an axial guide channel formed with a guide path having spaced apart locking seats. Angled transition surfaces extend toward each of the locking seats. A deadbolt member having a transverse locking member slot is mounted within the guide channel and a locking member, including a locking tab disposed in the guide path, is mounted within the locking member slot. A key cylinder having a rotatable cam is mounted on the housing. When the key cylinder is rotated, the cam engages the locking member to drive the locking tab from a locking seat and engage an abutment wall of the deadbolt member slot to drive the deadbolt member in the guide channel such that the tab moves in the guide path toward the other locking seat.

Abstract: For a circular lock currently in popular use that is disposed in covering relation over lugs projected internally of the lock and consequently results in the holding of the lock stationary, an anti-tampering guard that encircles the lock and has a rotational degree of movement, so that a tampering tool must engage the guard interposed between the tool and the lock and any force applied by the tool merely results in harmless rotation of the guard rather than a twisting off of the lock-engaged lugs.

Abstract: A security lock having a main locking bolt connected to a U-shaped tail member slidably mounted in a housing secured to the door. The U-shaped tail member has an upper branch engaged by a turnable driving arm for movement between a retracted unlocked position for the main bolt and an extended locked position therefor. A spring biasses the driving arm to move the U-shaped tail member to the extended locked position. A key cylinder and an interior handle are connected to the driving arm to turn the arm and unlock the bolt. A spring-loaded latch is biassed to engage the lower branch of the U-shaped tail member in the retracted unlocked position. In the closed position of the door, the latch releases the U-shaped tail member which, under the action of the spring, drives the main bolt to its locked position. The latch can be operated when the door is open to release the U-shaped tail member so the main bolt extends from the lock.

Abstract: A padlock has an outer body part which prevents the application of torque from a wrench to force the shackle open. One or both ends of the padlock are also configured to prevent application of a wrench, the configuration being generally conical spheroidal or tapered configuration preferably at least at the shackle end of the body of the padlock.

Abstract: The present invention provides for an apparatus for retrofitting an existing wooden door having opposing surfaces to upgrade the fire rating of the existing door. The apparatus includes a door cover steel sheet having a non-combustible insulating coating on an interior surface for coveting at least one surface of the door and a lock set reinforcement bracket having a non-combustible insulating coating on an interior surface for surrounding the lock set opening on an opposing surface of the door, the apparatus providing at least a twenty minute fire rating to the retrofitted door. In an aspect of the invention, there is provided a method for increasing the fire rating of a door having opposing surfaces.

Abstract: A security locking device for releasably locking gates, doors and the like is made up of a bolt receiver and a locking bolt assembly, the locking bolt assembly including a slidable locking bolt which extends through a mounting tube for slidable movement between an extended locking position in the bolt receiver and a retracted, unlocked position removed from the receiver, and a locking wedge extends through slots in the mounting tube and locking bolt to retain the locking bolt in the locking position, the wedge in turn being locked securely in position by a locking member within the mounting tube. Mounting brackets are provided for tamper-proof attachment of the bolt receiver and locking bolt assembly to the respective members to be releasably locked.

Abstract: A high security lock includes a lock housing, lock cylinder and a lock core. The lock housing defines a key receiving surface and a cavity for receiving the lock cylinder. A cover plate is attached to the lock housing and is located between the lock cylinder and the key receiving surface. The cover plate covers a portion of the lock core. A retaining shield is received in the cavity, which engages the cover plate and is attached within the cylinder.

Abstract: A gearshift stick lock for an automobile having a transmission case includes a lock body, a shackle having two legs engageable with the lock body, a sleeve for wholly fitting over a gearshift stick of the automobile and extending downwardly into the transmission case, the sleeve including two threaded holes and two rings fixed to the sleeve, each of the two rings having a hole aligned with a corresponding one of the threaded holes, two screws each extending through a corresponding one of the threaded holes to bear against the gearshift stick of the automobile thereby fixedly mounting the sleeve thereon, and the legs of the shackle being engaged through the rings respectively and engaged with the lock body so as to lock the gearshift stick in place.

Abstract: A gearshift stick lock for an automobile including a lock body, a shackle including two legs engageable with the lock body, a sleeve for wholly fitting over a gearshift stick of the automobile and including two threaded holes and two lugs fixed to the sleeve, each of the two lugs having a hole aligned with a corresponding one of the threaded holes, and two screws each extending through a corresponding one of the threaded holes to bear against the gearshift stick of the automobile thereby fixedly mounting the sleeve on the gearshift stick, the legs of the shackle being engaged through the lugs respectively and engaged with the lock body so as to lock the gearshift stick in place.

Abstract: The present invention relates to an anti-theft device capable of engaging a middle portion of a steering wheel containing an air bag device. This device includes an air bag cover having a front portion, a first side portion and a second side portion. The first side portion and the second side portion both extend backward from the front portion. A stabilizing member for engaging a steering column and attached to the first side portion of the air bag cover. A bracket member attached to the air bag cover for securing the air bag cover to the steering wheel.

Abstract: A king pin locking mechanism employs a sliding locking bar in a housing for engaging a king pin. A key-activated cam moves dead bolts outwardly of the locking bar to lock that bar in the housing. Tampering forces applied to the cam deform a deformable member relocking the cam and dead bolts against unauthorized movement.

Abstract: A device (2) for protecting a padlock (22) and a lock (40,44,48) to which the padlock is connected, the device includes a shield portion (4) which is in the form of a generally C-shaped body having a mounting plate (6) extending across the body, the mounting plate (6) includes openings (6 and 18) through which the padlock shackle (26) passes, the device being held captive relative to the lock and substantially surrounding the padlock shackle and parts of the lock in order to minimise tampering of the padlock and the lock.

Abstract: An improved automobile anti-theft guard plate that provides exceptional strength through the use of two bonded plates. The first plate has a flanged circumference to enclose the second plate. These flanges, especially when combined with the second plate's inherit strength, provide for enhanced rigidity to withstand deformation from a pry bar. An opening through both plates permits the automobile's handle lock activation and door opening mechanism access to these mechanisms within the automobile door. A tower or vertical member on the guard plate extends vertically from the plates and at least partially surrounds and shields the handle's mechanisms to even further dissuade tampering by a thief. The guard plate is additionally designed to permit the handle to be secured thereto through the use of tabs which engage the handle at the same time the handle is engaging the opening mechanism.

Abstract: A locking device which includes a new combination of components, namely, the hasp and a round cylinder lock protectively embedded in an indentation built into the hasp. The hasp is designed to be used with a round cylinder lock of the type disclosed in U.S. Pat. No. 3,769,821 and sold by the American Lock Company. The hasp of the present invention is comprised of a steel reinforced plate, the steel reinforced plate has a truncated circular indentation on a front side thereof for encapsulating an outer diameter of the round cylinder lock. The truncated circular indentation has a hasp hole, a locking pin extends from the round cylinder lock and is receivable in the hasp hole. The hasp hole is sized slightly larger than the outer circumference of the locking pin, the locking pin is fixed to the round cylinder lock and extends axially outwardly thereof.

Abstract: A U-lock includes a detachable header with extensions that fit around the arms of the U-bar and extend along the length of those arms to provide strength to the U-lock. The header can be used so that its base is locked at the end of the arms of the U-shaped bar or it can be inverted when locking smaller objects so that its base is locked along the lengths of the arms taking up some of the gap between the locked object and the base of the header. The header is locked to the arms of the U-shaped bar by a locking mechanism which secures the header to the arms of the U-shaped bar in four different places, two on each arm. The U-lock and header with extensions can also be used in combination with security spacers for further security.

Abstract: An apparatus for secure positioning over and around a steering wheel and steering column to prevent theft. The apparatus comprises a plate positionable over the top of a central part of a steering wheel having a steering column with laterally extending rods for turn signals and the like. The plate has a short post extending downwardly from one edge thereof with an upper end pivotally secured about an axis with respect to the plate and with the lower end having an inwardly projecting leg. The plate also has a long post which extends downwardly from a second edge of the plate diametrically opposite from the first edge with an upper end pivotally secured about an axis with respect to the plate about an axis parallel with the first axis and with a lower end having an outwardly projecting leg. The apparatus further includes a first housing half and a second housing half positionable around the steering column beneath the steering wheel.

Abstract: An anti-theft device for locking up the steering wheel of an automobile; the device has a locking rod, of which one end is welded to the center of a symmetrical locking hook, while the other end thereof is inserted into a lock rod groove of a casing portion. The casing position has a locking assembly to prevent the locking rod from moving unintentionally. One side of the casing portion is fastened with a L-shaped locking plate facing the locking hook. The symmetrical locking hooks is used to hold the spoke of a steering wheel. The L-shaped locking plate can be moved by pushing the casing portion until holding the grip wheel of a steering wheel so as to prevent a car from being stolen.

Abstract: A guard for enclosing the shackle of a padlock secured to a hasp staple comprises a substantially U-shaped housing comprising a front wall and spaced apart side walls connected to the front wall; and a rod connecting the side walls and spaced apart from the front wall. The rod divides the housing into upper and lower portions. The front and side walls and the rod are configured to permit the padlock to be received within the housing such that the body of the padlock is disposed below the rod and the shackle of the padlock between the rod and the front wall. The rod is positionable between the body of the padlock such that the housing is held captive to the padlock. The upper and lower portions of the housing are adapted to enclose the shackle of the padlock at least in one position of the rod between the staple hasp and the padlock body.

Abstract: A door latch guard for guarding the latch of an outwardly opening door and for preventing spreading of the door away from an adjacent door frame comprises a cover plate having a first flat portion for connection to the door and a second flat portion adapted to overlie the adjacent door frame. A third portion of the cover plate, between the first and second flat portions, defines a groove adapted to overlie the door and the door frame and to receive a protruding latch strike plate. The groove includes a flat outer portion having a width adapted to accommodate locks installed in the door at a plurality of different backsets. In addition, the cover plate has a cut-out adapted to allow the cover plate to be mounted flat against the door, without interfering with the door lock hardware, yet still receive the protruding latch strike plate, regardless of the backset at which the door locks are installed.

Abstract: An improved latch guarded door lock and frame system is provided. A recessed surface is provided in a hollow metal frame, and is dimensioned to accommodate a latch guard so that the external surfaces of the door, frame and latch guard are flush. The recessed surface of the frame behind the latch guard is further reinforced by employing a thicker wall than is used in the rest of the frame, and by welding a square metal tube into the recessed region. A medial metal support is also welded into the lock box cavity in order to prevent the lock box from collapsing under stress. The resulting door lock and frame system is less penetrable than prior systems, and provides greater security because the latch guard is less vulnerable to prying and because the frame and lock box are reinforced, thus less likely to collapse under stress.

Abstract: A joint lock with improved structure is disclosed. The joint lock includes a steel rope wire, a latching member for latching the steel rope wire in position, a bendable covering sleeve for covering the steel rope wire, and a lock device. The lock device is composed of a locking member and a locking plug, in which the locking member is fixed on one end of the rope wire and the locking plug is fixed on the other end of the rope wire. The latching member is composed of a plurality of fork chucks and a latching ring having its inner diameter slightly larger than the outer diameter of the steel rope wire and being slidable along the rope wire. The fork chucks is a flexible outward fork-like structure in order to engage with the inner wall of the covering sleeve. The covering sleeve is composed of a plurality of joint units for covering the rope wire so that the rope wire is bendable correspondingly when the covering sleeve is bent.

Abstract: A protective guard is provided for a lock cylinder in a door, which consists of a generally rectangular metal plate assembly having a central passageway therethrough. Components are for attaching the plate assembly to the door with the central passageway generally aligned with the lock cylinder. The attaching components are concealed, removable and adjustably connected to an inner side of the plate assembly, thereby rendering the lock cylinder less susceptible to tampering.

Abstract: A cylindrical door lock set includes inner and outer knob supporting plates, a turning mechanism, an annular mounting plate and a latch unit. The outer knob supporting plate has a central hole and an inner side provided with a pair of posts on two sides of the central hole. The posts are hollow and are threaded internally. The turning mechanism is supported on the inner side of the outer knob supporting plate and is provided with a turn shaft. The annular mounting plate is secured on the inner side of the outer knob supporting plate and is formed with a pair of mounting shafts and a central hole to permit the turn shaft of the turning mechanism to extend therethrough. The latch unit is formed with a shaft engaging hole to permit the turn shaft to extend therethrough, and two side holes disposed on two sides of the shaft engaging hole in a lengthwise direction of the latch unit to receive respectively the mounting shafts. The latch unit is disposed between the posts of the outer knob supporting plate.

Abstract: An anti-theft device surrounds the plastic housing for the ignition switch, the protruding plastic lock barrel and the exposed end of the lock cylinder with hardened steel. The device consists of (i) a hardened steel bracket which attaches directly to the housing and the steering column with screws, (ii) a cup-like cover which attaches to the bracket, covering the housing, the screws and the protruding lock barrel with hardened steel, and (iii) a torque-sensitive end cap which is rotateably supported by the cover. The torque-sensitive cap consists of an outer sleeve and a center disk press fit into the sleeve. The disk includes a key slot for access to the lock cylinder. The disk is the same size as an opening in the cover, which accommodates key access to the lock cylinder. The sleeve is rigid and larger in diameter than the opening. An indentation in the cap sleeve engages a boss on the lock cylinder to align the slot in the disk with the lock cylinder keyhole and operate the lock.

Abstract: An anti-theft device for vehicles comprising a steering column shackle in the form of a generally cylindrical collar defined by a pair of semicircular or arcuate shaped bands hingeably connected together with an adjusting lockable latch assembly. At least one of the bands comprising the sleeve has at least one opening therein to accommodate a shift lever extending from the steering column. The sleeve is positioned around the steering column and shift lever and locked with a key to prevent thieves from breaking the tubular steering column housing open, exposing the ignition starting and gearshift rod mechanisms therein.

Abstract: A shackleless padlock system is provided which includes a lock mechanism having a cylindrical body both protruding from one end thereof with a key-operating locking pin which retractably protrudes from the lock mechanism from a first to a second position for selectively engaging portions of a padlock body in order to either provide bolt engagement with the pad-lock body or for guiding a lock mechanism within the padlock body. Access to the locking pin in order that the lock mechanism may easily be removed and replaced with a different lock mechanism.

Abstract: A U-lock includes a detachable header with extensions that fit around the arras of the U-bar and extend along the length of those arms to provide strength to the U-lock. The header can be used so that its base is locked at the end of the arms of the U-shaped bar or it can be inverted when locking smaller objects so that its base is locked along the lengths of the arms taking up some of the gap between the locked object and the base of the header. The header is locked to the arms of the U-shaped bar by a locking mechanism which secures the header to the arms of the U-shaped bar in four different places, two on each arm. The U-lock and header with extensions can also be used in combination with security spacers for further security.

Abstract: A security device for coin operated machines comprises a closure adapted to overlie the portion of a coin operated machine containing the coin return slot and the coin box. The closure is hingedly affixed to the case of the machine and is formed from a sheet of material having a composition and thickness to resist bending of the closure by prying. Openings are provided in the closure for access to the coin insert slots and coin return ports of the machine. A raised rib formed on the case or on the inner face of the closure surrounds the area of surface of the case where the coin box and coin return ports are located, The rib is disposed between the case and the closure to prevent insertion of a prying tool between the closure and the case.

Abstract: A structure is provided to prevent access to the latch pin of a dead bolt or latch lock. For dead bolts, a sleeve is provided which is received over the bolt frame in which the latch pin reciprocates. The sleeve is secured to the frame in such a manner that the latch pin cannot be accessed without removing the sleeve. For latch locks, a sleeve is provided with an extending tongue, which tongue covers the ears of the latch pin and denies access to the ears.

Abstract: A security shield device is provided in two embodiments. One embodiment includes a front cover, a rear base and a connector member connecting the front cover to the rear base. The front cover is mounted to a slidebolt latch for movement between a covered position shielding a padlock shackle coupled to a latch portion of a slidebolt latch and an uncovered position displaced from the latch portion of the slidebolt latch. The rear base mates with the latch portion of the slidebolt latch so as to attach the rear base to the slidebolt latch when the padlock shackle is coupled to the slidebolt latch. The connector member prevents movement of the front cover relative to the slidebolt latch away from the rear base which would expose the shackle of the padlock. The other embodiment includes a front cover, a rear base connected to the front cover, and apertures defined therein aligned with openings in stationary and movable latch portions of a slidebolt latch.

Abstract: A safe has, in addition to its strong body and door and its combination lock knob and dial, a security mask that is strongly and fixedly secured to the upper side of the door over major portions of the dial, for the purpose of preventing a burglar from hammering on the dial and then driving the spindle and actuating the relockers of the safe. In accordance with another aspect of the invention, an anti auto-dialer is fixedly connected to the security mask over the knob of the combination lock mechanism, to prevent operative engagement between the knob and an auto-dialer mechanism while at the same time permitting manual operation of the knob to work the combination.

Abstract: A cylinder guard including a plurality of guard plates, at least one of which is formed with a plurality of non-rotatable bolt head seats and a plurality of bolts having heads non-rotatably seated in the non-rotatable bolt head seats and arranged for mounting the cylinder guard onto a door.

Abstract: A security device for a coin operated washing machine having a cabinet and a coin slot mechanism housing is provided and consists of a shield attached to the cabinet for protecting the coin slot mechanism housing from vandalism, so as to prevent theft of coins and an unauthorized operation of the coin operated washing machine.

Abstract: A security device designed for protecting the shackle of a disk shaped padlock when mounted on a door of a container which consists of a housing for an armor protected latch bar which housing defines a recess providing access to an aperture in the bar by a circular shackle of the padlock. The recess also encases most of its housing exposing only the key tumbler of the lock which if tampered with will not cause movement of its concealed circular shackle. The latch bar is at least partially covered with a high carbon steel at the point it extends into an associated keeper.

Abstract: The present application relates to a protecting sleeve for shielding and reinforcing a bicycle lock mechanism, which sleeve can conveniently be applied to many existing bicycle locks. The sleeve comprises an elongate body having a central bore sized to receive a cylindrical portion of a lock in which the lock mechanism is located. It has been found that this area of the lock is the weakest and the lock can be defeated by breaking the locking mechanism. The protecting sleeve includes intermediate its length a channel passage through which a locking member can pass for releasably engaging the locking mechanism. The protecting sleeve is preferably made of a high strength material, such as an aircraft aluminum alloy material which also acts as a thermal moderator.

Abstract: A lock housing for an automobile steering lock device has a heat-treated, very hard protective cylinder between a cylindrical wall of the housing and the lock. The lock has a rod-shaped dead bolt extending in a same-shaped hollow space in the housing to extend into one of the grooves in an elongate rod member to immovably lock the rod member in an elongate tubular member in any one of a plurality of positions.

Abstract: A protector for a lock used in combination with a steel cable to prevent theft of a two-wheeled vehicle. The lock is received within the protector and when at a locked condition, the shackle portion thereof is inaccessible, as to a bolt cutter, and where the steel cable is incapable of being severed by a bolt cutter.

Abstract: A concealed shackle padlock includes a shackle having a first straight protecting tube sleeved on the fixed end thereof, a second straight protecting tube removably sleeved on the free end of the shackle and connected to the casing of the padlock by a chain, and an arched protecting tube sleeved on the arched middle part of the shackle. By way of the protection of the first and second straight protecting tube, and the arched protecting tube, it is nearly impossible to open the padlock with bolt cutters, hacksaws or jimmying tools.

Abstract: An auxiliary lock with an anti-breakage device having a seat combined with a base and an inner ring covered with an outer ring, a latch unit being deposited in the housing and having a recessed opening in an outer end for a reinforcing plate to fit therein and then a face plate sealing up the reinforcing plate to protect the latch unit from breakage by illegal attempt.

Abstract: A motor vehicle anti-theft device is provided which consists of an enclosure to fit about a steering column and an ignition switch on the steering column of the motor vehicle. A mechanism is for locking the enclosure about the steering column, so as to prevent an unauthorized operation of the ignition switch on the steering column. A cover member extends from the side of the enclosure to block any ignition switch alternately located on the dashboard of the motor vehicle, to also prevent the unauthorized operation of an ignition switch on the dashboard.

Abstract: The automobile anti-theft device consists of a hardened steel collar which encircles the steering column of the automobile and includes two rotatably attached sections which are attached to each other by sliding one end of a first section underneath an end of the second section. The first section has a projection on the end which fits into a radially extending recess on the underside of the second section and thus acts as a pivot point about which the first section rotates relative to the second section. The first section consists of an arcuate body, which is shaped to cover a portion of the side of the steering column, and a projection which extends radially out from the arcuate body. When this section is in place on the steering column, the projection is thus approximately perpendicular to the steering column. The second section consists of an arcuate body which is shaped to cover a portion of the steering column which is contiguous with and on the same side as the portion covered by the first section.

Abstract: An access cover plate is secured to a door by tamper-proof fasteners. A hole in the cover plate is concentric with a cylinder lock keyhole and provides access for the key and actuation of the primary lock. The cover plate access hole is closed off by a removable threaded plug which engages female threads in the hole of the cover plate. When secured in place, the plug is forcibly tightened against the face of the cylinder lock. The plug includes a recessed, tamper-proof wrenchable socket which permits removal of the plug only by a specially designed socket wrench. The tamper-proof socket has a polygonal wall and an axial guard pin.

Abstract: An improved automobile handle guard plate assembly which provides added strength via a lipped brace which overlays and strengthens a security plate. The security plate and the brace are secured together with an adhesive and positioned between the exterior door handle and the automobile's door. The door handle is permitted easy access to the locking mechanism within the door via an opening in the security plate. A thief trying to enter the automobile by accessing the locking mechanism through the door, finds a security plate to prevent access and a brace on the security plate to preventing deformation of the security plate.

Abstract: A security device for cargo doors and similar articles which utilizes a conventional padlock to secure the horizontally extending handle present on many conventional double cargo doors of cargo carrying vehicles. The security device includes a stationary base member which is mounted on the cargo door by carriage bolts or other conventional fasteners and a rotatable blocking member which is rotatably mounted on the cargo door above the stationary base member. The rotatable blocking member can be rotated in a plane parallel to the cargo door upwardly in relation to the stationary base member to allow the horizontally extending handle to be placed adjacent the stationary base member.

Abstract: A security shield for padlocks having U-shaped shackles and used with traditional hasp, staple, and various other types of attachment devices. The shield is a tube like device into which the padlock will fit, with a tab to limit longitudinal travel, and provided with clearance openings permitting the free swing of the unlocked shackle, and engagement with the attachment devices to be made secure. The combination of these elements provides protection for the shackle, and attachment device elements from the commonly used methods of forced attack.

Abstract: An antiprying member is secured onto a metal frame adjacent a protective flap member secured onto a security door that is hingedly mounted onto the metal frame. The antiprying member extends along the free end of the flap member and has a thickness at least the same as that of the flap member and is spaced from the flap member no greater than the thickness of the flap member to prevent a prying member from bending the flap member away from the metal frame or to pry open the security door. A pin having an annular notch is secured to the flap member and extends through a hole in the door frame to prevent the door frame from being pried or twisted away from the door.

Abstract: An improved shackleless padlock which engages and secures a conventional hasp configuration by use of a pop-out lock mechanism which has a non-rotating cylindrically extending lock bolt that engages the hasp staple. The pop-out lock mechanism is created by use of a spring to bias the lock mechanism outwardly from the padlock body when the lock contained within the lock shell is in a locked position, the lock mechanism is pushed inwardly into the padlock body until it latches into a fixed position and the lock bolt consequently engages the hasp staple. Strength is added to the die cast metal alloy construction of the padlock body by use of vertical and horizontal hardened, force-fit pins embedded in the padlock body. Also, a material saving well is formed in the top face of the padlock body which may also be utilized for displaying a nameplate.

Abstract: An apparatus for fixedly mounting to a filing cabinet a locking plunger to prevent inadvertent depressing of the locking plunger relative to the filing cabinet to prevent inadvertent locking of the filing cabinet. The organization includes a lock member defined by an elongate central cavity, with the central cavity of a predetermined length greater than a predetermined height of an associated lock plunger. The lock member includes a rear wall formed with threaded bore, and a set screw directed to the rear bore, whereupon mounting of the lock member receives the cabinet plunger lock within the elongate cavity permitting projection of an associated set screw to engage and secure the associated plunger. A modification of the invention includes a guide bore positioned above the threaded bore to receive a drill bit therethrough to direct a drill bit member to form a blind bore within the plunger lock to subsequently receive the set screw therewithin.

Abstract: An improved enclosure assembly of the type including an openable enclosure, a locking member movable relative to the enclosure for selectively locking or unlocking it, a keeper mechanism mounted on the enclosure for retaining the locking member in its locked position, and a manually operable lock for selectively locking the locking member in its locked position.An improved tamper-proof locking assembly is provided which greatly minimizes the danger of unwanted intrusion into the locked enclosure. A guard housing having a single opening is placed about the keeper mechanism. The single opening of the guard housing is made large enough for the insertion of a human hand therein when it is desired to unlock the manually operable lock, but is made too small for insertion of a cutting instrument that could cut apart either the locking member, the keeper mechanism, or the manually operable lock.

Abstract: A lock protector (1) for the barrel (17) of a key operated lock (2) which comprises a sleeve (3) to fit over the barrel (17). The sleeve (3) has a rotatable keyway protector (7) located adjacent the keyway (6) of the lock (2), the keyway protector (7) having a slot (10) therein which aligns itself with the keyway (6) for use. The width of the slot (10) together with the distance between the external portion of the slot (10) and the keyway (6) prevents objects other than the correct key shank from being inserted within. The lock protector (1) is also provided with a retaining means (4) to prevent longitudinal movement of the barrel (17) within the sleeve (3) once assembled.